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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1358871

Title:
  USB 3.0 connection is unreliable + xHCI xhci_drop_endpoint called with
  disabled ep

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  On Utopic 3.16.0-9-generic x86_64 kernel:

  I'm using the Intel DQ77KB desktop board [1]. Apart from the board and
  some disks and memory the computer has no other hardware. The board
  has four usb 3.0 ports on the back. Using any of those ports, with my
  USB 3.0 hub, with my phone triggers a swarm of messages like this:

  xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep
  ffff880354156900

  If I connect the 3.0 hub via USB 2.0 hub instead, or use the 2.0 hub
  directly all of the problems go away.

  [1] http://www.intel.com/content/www/us/en/motherboards/desktop-
  motherboards/desktop-board-dq77kb.html

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-9-generic 3.16.0-9.14
  ProcVersionSignature: Ubuntu 3.16.0-9.14-generic 3.16.1
  Uname: Linux 3.16.0-9-generic x86_64
  ApportVersion: 2.14.6-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  zyga       3468 F.... pulseaudio
   /dev/snd/controlC1:  zyga       3468 F.... pulseaudio
   /dev/snd/controlC0:  zyga       3468 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Aug 19 20:10:25 2014
  HibernationDevice: RESUME=UUID=2ecb937b-2594-44f1-b19d-a601fa6a8982
  InstallationDate: Installed on 2014-01-15 (215 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140115)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-9-generic.efi.signed root=UUID=3530e29d-4954-45ea-b3d7-a103ac745265 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-9-generic N/A
   linux-backports-modules-3.16.0-9-generic  N/A
   linux-firmware                            1.132
  RfKill:
   
  SourcePackage: linux
  SystemImageInfo:
   current build number: 0
   device name: 
   channel: daily
   last update: Unknown
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/08/2013
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: KBQ7710H.86A.0052.2013.0708.1336
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DQ77KB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAG40294-401
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrKBQ7710H.86A.0052.2013.0708.1336:bd07/08/2013:svn:pn:pvr:rvnIntelCorporation:rnDQ77KB:rvrAAG40294-401:cvn:ct3:cvr:

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